Oman began his career in accounting at Deloitte, Haskins and Sells in Des Moines. He joined Wells Fargo (then Norwest) in 1979 at Des Moines-based Wells Fargo Financial, Inc., where he held a variety of management positions. In 1985, he joined Wells Fargo Home Mortgage and held a number of senior management positions until 1989 when he was named president and chief executive officer. Under his leadership, the company grew into one of the largest mortgage banks in the nation, serving all 50 states. In 1997, Oman was promoted to group executive vice president of Wells Fargo & Company with responsibility for multiple business units, and in 2005 was promoted to senior executive vice president. Oman has served on various professional and community boards, panels and committees. He is a board member of the University of Northern Iowa Foundation and Greater Des Moines Community Foundation. Oman also serves as the chairman for the Greater Des Moines Partnership and is a member of the Iowa Business Council. Oman holds a bachelor’s degree from the University of Northern Iowa, Cedar Falls.